Table 1: Summary of all the observations from the XSA that were used in this analysis. We list the observation identifier, the date of the observation and the exposure of the observation.

Obs. ID.	Date	Exposure (s)	Obs. ID.	Date	Exposure	Obs. ID.	Date	Exposure (s)
0099760201001	2000-03-22	49 332.0	0113891001002	2000-04-06	11 605.6	0113891101002	2000-04-07	16 888.5
0125300101012	2000-05-28	32 199.8	0124711401002	2000-05-29	17 663.9	0125920201002	2000-06-05	23 447.8
0126700401008	2000-06-15	7344.45	0124710401002	2000-06-23	8302.49	0124711101002	2000-06-24	28 264.6
0127921001001	2000-07-21	53 637.1	0127921201001	2000-07-23	18 456.8	0127921101001	2000-07-23	7264.02
0127720201001	2000-07-25	22 364.9	0112580601001	2000-07-26	33 567.5	0111210201001	2000-07-28	6135.45
0101440101001	2000-09-05	49 196.7	0101440701002	2000-09-05	29 643.4	0105460301002	2000-09-07	18 773.5
0104460401002	2000-10-12	11 898.8	0105260201001	2000-10-13	17 851.8	0123720301003	2000-10-27	56 029.2
0111400101001	2000-11-03	50 115.7	0106460101001	2000-11-06	54 873.2	0101440401001	2000-11-07	45 359.8
0101040301001	2000-11-28	37 070.4	0093552701001	2001-01-28	24 138.1	0086360401005	2001-03-12	44 171.7
0064940101001	2001-03-24	36 378.6	0083250101004	2001-04-09	19 805.2	0112870201002	2001-04-17	15 116.5
0111550401002	2001-06-01	91 601.5	0059140201001	2001-06-17	12 191.9	0051760101001	2001-06-17	7053.58
0051760201001	2001-06-18	15 740.6	0109470201001	2001-07-11	12 481.7	0137750101001	2001-07-29	17 501.8
0109100201002	2001-08-17	9935.07	0000110101001	2001-08-19	23 847.7	0089210601001	2001-10-11	54 619.6
0089210701001	2001-10-11	13 630.0	0089210701002	2001-10-11	22 315.9	0085150201002	2001-10-21	37 300.7
0085150301003	2001-10-21	31 526.0	0022740301001	2001-11-04	35 347.6	0028740101001	2001-11-15	28 144.9
0089210101001	2001-12-01	8354.39	0084230201001	2001-12-14	28 220.5	0083000301001	2001-12-15	26 436.8
0113050501001	2001-12-23	25 154.6	0084030101001	2001-12-28	42 853.5	0001930301001	2001-12-28	24 582.5
0106860201001	2001-12-28	15 353.4	0002740301001	2001-12-29	6847.05	0093200101002	2001-12-29	39 631.2
0084140501002	2002-02-04	17 436.3	0065820101001	2002-02-27	49 238.9	0011420201001	2002-03-17	40 687.2
0110661601002	2002-03-19	7267.89	0058940101002	2002-03-20	27 788.2	0136000101002	2002-04-17	17 691.4
0033540601001	2002-05-11	5224.01	0059140901001	2002-05-22	15 889.5	0082140301001	2002-05-22	32 887.9
0094360601001	2002-05-23	8236.27	0041750101001	2002-06-15	51 641.7	0134521601011	2002-06-18	11 043.9
0134521601003	2002-06-18	24 111.6	0031740101001	2002-06-19	35 180.5	0135745801001	2002-09-29	13 120.2
0112980401001	2002-09-30	16 528.9	0148850201001	2002-10-01	23 730.5	0089370501001	2002-10-01	22 454.5
0147511101001	2002-10-23	97 292.4	0150050101002	2002-11-26	23 751.9	0147511801001	2002-12-06	90 684.3
0112260801001	2002-12-07	13 190.8	0112230201001	2002-12-18	25 541.5	0150480501001	2002-12-22	21 904.7
0070340101002	2003-02-02	17 023.8	0152680801001	2003-02-26	16 371.9	0157360601003	2003-02-26	6618.36
0146390201001	2003-03-29	25 388.8	0153220601001	2003-05-28	10 902.0	0150680101001	2003-07-26	42 666.2
0152131201002	2003-08-16	9502.71	0049540301001	2003-08-17	25 734.6	0049540401001	2003-08-19	24 037.2
0149630301001	2003-09-16	19 768.3	0017740401007	2003-10-05	27 582.9	0017740201007	2003-10-09	17 879.9
0017740601007	2003-10-11	22 288.5	0017740701007	2003-10-13	21 736.3	0147760101001	2003-10-14	36 842.6
0017740501007	2003-10-20	26 551.5	0148742501001	2003-10-28	7917.18	0162160201002	2003-11-24	14 003.8
0162160401002	2003-12-06	10 509.2	0162160601002	2003-12-14	12 360.0	0205260201009	2004-01-16	13 440.0
0201230201001	2004-01-21	18 093.1	0200240301001	2004-04-02	15 255.5	0164560701001	2004-07-23	31 608.0
0164560901001	2004-09-12	58 437.8	0205970201001	2004-09-20	48 145.6	0206060201001	2004-11-03	31 485.3
0202610801001	2004-11-09	7179.57	0201440101001	2004-11-09	10 311.2	0202610801002	2004-11-09	17 784.4
0201903101001	2004-11-10	27 833.5	0201900501001	2004-11-12	27 163.9	0203360901001	2004-11-20	27 258.5
0203240201017	2004-12-04	18 804.6	0203240201001	2004-12-05	19 919.2	0203360101001	2004-12-11	30 644.7
0200630201001	2004-12-20	44 644.7	0202370301001	2005-01-08	25 837.4	0202130301001	2005-01-15	37 385.1
0212480701002	2005-06-05	19 008.7	0211280101002	2005-06-12	42 621.5	0304531501006	2005-06-22	15 215.0
0305920601001	2005-06-23	15 224.2	0304050101001	2005-06-30	69 689.5	0212480801001	2005-07-01	48 830.5
0302420101001	2005-07-08	85 607.2	0304531701002	2005-07-10	7502.96	0164571401001	2005-08-21	56 486.1
0300800101002	2005-08-31	45 875.7	0300540101001	2005-09-14	23 398.9	0303100101001	2005-09-26	52 629.3
0300600401001	2005-10-08	28 648.7	0305560101001	2005-10-21	27 595.6	0302310501002	2005-10-23	23 162.3
0159760301001	2005-11-01	37 543.4	0302351601007	2005-11-27	43 034.0	0302310301002	2005-12-18	43 998.8
0303560201001	2005-12-19	6516.42